[xmonad] All windows in row?

(Not sure if this is the best place to ask, but I have already tried google and found nothing useful.) What is the best and simplest layout manager that will allow me to put all windows in a single row, and possibly resize each of them? Sometimes I'd like to have three windows tiled horizontally, and I guess xmonad is perfect for that. I found ZoomRow, and it looks exactly like what I need, but when I add it to xmonad.hs, I get an error message: "Could not find module `XMonad.Layout.ZoomRow'". And then, how can I install it? Thanks for the help. -- davi pires